package com.lecyon.farm.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 登录状态拦截器RedisSessionInterceptor
 *
 * @author Yao Zheng
 * @Date 2019/11/24 13:15
 */
public class RedisSessionInterceptor implements HandlerInterceptor {

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        // 无论访问的地址是不是正确的，都进行登录验证，登录成功后的访问再进行分发，404的访问自然会进入到错误控制器中
        HttpSession session = request.getSession();
        if (session.getAttribute("loginSessionId") != null) {
            try {
                // 验证当前请求的session是否是已登录的session
                String loginSessionId = redisTemplate.opsForValue()
                        .get("loginUser:" + (Integer) session.getAttribute("loginSessionId"));
                System.out.println("用户已登录，sessionId为： " + loginSessionId);
                if (loginSessionId != null && loginSessionId.equals(session.getId())) {
                    return true;
                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        response401(response);
        return false;
    }

    private void response401(HttpServletResponse response) {
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        System.out.println("用户未登录！");
//            response.getWriter().print(JSONObject.toJSONString(new RestResponse<>(404, "用户未登录！")));
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {

    }

}
